Reports have suggested that the Chile star has his heart set on a move to Barcelona and, as a consequence, he is refusing to even meet City.
The English club are understood to have lodged a larger offer than Barca with Udinese, who are trying to offer players in exchange.
Gino Pozzo, the son of Udinese president Giampaolo Pozzo, has confirmed that Barca remain favourites for his signature, but he insisted Sanchez has not stated that Barca is his preference.
"I can say that Barcelona have the advantage over Manchester City right now," Pozzo said. "The player has not manifested any particular preference, although naturally we will listen to his opinion.
"We haven't concluded any deal yet because there are still some details to work through."
Reports claim that Barca's attempts to include Jeffren in a deal are not going down well with the player, while the chances of Udinese accepting Jonathan Soriano appear to have diminished also.
Source: Team Talk
Source: Team Talk